rheum palmatum atrosanguineum

i have been searching for information on this beautiful plant with very
little result. i know it is from w china grows to about 6ft.. tall with
almost palm like ridged very large leaves. there are tall spikes that
produce reddish type blooms. i would also like to know where i could
purchase the seeds or plants. thank
you
lp
onespanky at webtv.net